http://www.rfc-editor.org/rfc/rfc3839.txt
RFC 3839: MIME Type Registrations for 3rd Generation Partnership Project (3GPP) Multimedia files, R. Castagno, D. Singer2004-07-01T23:00:00-00:00This document serves to register and document the standard MIME types associated with the 3GPP multimedia file format, which is part of the family based on the ISO Media File Format. [STANDARDS-TRACK]